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		<title>a中target的含义</title>
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		<a target="_parent">在父框架集中打开被链接文档。</a>
		<a target="_blank">在新窗口中打开被链接文档</a>
		<a target="_self">	默认。在相同的框架中打开被链接文档。</a>
		<a target="_top">在整个窗口中打开被链接文档。</a>
		<a target="_search"></a>
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